In the US there seems to be no license needed for devices like this: http://www.rohmelectronics.com/downloads/products/focus/audio_lsi/bh1415f.pdf And 'my' power output (unintended ...) is about 100 dB lower than this chip's ... Peter P. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist